Command File

clock clka 0 1 0 0
clock clkabar 1 0 1 1
clock clkb 0 0 0 1
clock clkbbar 1 1 1 0
vector ir ir3 ir2 ir1 ir0
vector state s1 s2 s3 s4
vector oneflag zeroflag

ana state oneflag br incpc ldpcbuf loading ir

V RESTART 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

V LOADDONE 1

V ENTER 1

V DMSEG 0

V IMSEG 0

V ZEROFLAG 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1

V ir 0011

R

Notice:

• ONEFLAG is high whenever the ACC contains a non-zero value
• When ONEFLAG is low, BNEZ will not branch, so the next PC value will just be the current one incremented by 1
• When ONEFLAG is high, BNEZ will branch, so the next PC value will add the value on the bus to the current PC
• The BR signal triggers the PC mux to chose the value off the bus, instead of the hardwired 0001
• When BR is high, INCPC again goes high to load the new value

  entp should be driving the bus when this happens!!!